Internal-combustion engines – Cooling – With cooling of additional parts or materials
Reexamination Certificate
2001-01-17
2002-05-07
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Cooling
With cooling of additional parts or materials
C123S0730SC
Reexamination Certificate
active
06382145
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reed valve cooling apparatus for an internal-combustion engine and, more particularly, to a reed valve cooling apparatus for an injector type engine to be mounted on a small planing boat.
2. Description of the Related Art
Referring to
FIG. 8
showing a direct injection two-cycle engine provided with a reed valve in a vertical sectional view, an injector
14
is attached to a cylinder head
20
so as to inject fuel into a combustion chamber
21
, and an intake port member
29
is formed integrally with a crankcase
18
so as to project diagonally upward from the crankcase
18
. A reed valve
31
is fitted in the intake port member
29
. The reed valve
31
has a flange
36
which is held between the joining surface
37
of the intake port member
29
and the joining surface
38
of an intake manifold
30
. The intake manifold
30
is fastened to the intake port member
29
with bolts
42
. A throttle body
43
provided with a throttle valve
44
is joined to the upper end of the intake manifold
30
, and an air intake case
45
is connected to the throttle body
43
.
The reed valve
31
has a valve case
32
of aluminum integrally provided with the flange
36
, reeds
34
each having one end fixed to the base end of the valve case
32
, and stoppers
35
of a metal for limiting the opening of the reeds
34
. A heat insulating gasket
140
of, for example, paper is placed between the joining surface
37
of the intake port member
29
and the flange
36
of the reed valve
31
.
The heat insulating gasket
140
is placed between the joining surface
37
of the intake port member
29
and the flange
36
of the reed valve
31
to retard conduction of heat from the engine to the reed valve
31
. However, in some cases, it is difficult to prevent temperature rise in the reed valve
31
through heat insulation only by the heat insulating gasket
140
. For example, in the direct injection type engine provided with the injector
14
as shown in FIG.
8
and not provided with any carburetor, the effect of fuel (air-fuel mixture)on cooling the reed valve
31
cannot be expected and hence it is difficult to prevent temperature rise in the reed valve
31
. If the reed valve
31
is heated by heat transferred thereto by heat conduction or heat radiation, the strength of the reeds
34
is reduced. The strength of the reeds
34
can be increased by increasing the thickness of the reeds
34
, which, however, deteriorates the response characteristic of the reeds
34
.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a reed valve cooling apparatus capable of performing a forced cooling of a reed valve of an internal-combustion engine in order that the reed valve has satisfactory response characteristic and sufficient strength.
According to a first aspect of the present invention, a reed valve cooling apparatus for cooling a reed valve fitted in an intake port member formed on a crankcase of an internal-combustion engine, the reed valve having a flange placed between a joining surface of the intake port member and a joining surface of an intake pipe, the reed valve cooling apparatus includes:a water jacket formed in a circumferential wall of the intake port member; and a highly heat-conductive gasket placed between the joining surface of the intake port member and the flange of the reed valve.
Heat transferred from the crankcase to the intake port member can be dissipated by cooling water circulating through the water jacket. The reed valve can be effectively cooled by conduction of heat from the reed valve through the highly conductive gasket to the intake port member.
Preferably, the reed valve cooling apparatus further includes: a water jacket formed in a circumferential wall of the intake pipe; and a highly heat-conductive gasket placed between the joining surface of the intake pipe and the flange of the reed valve.
Both the intake port member and the intake pipe can be cooled. The reed valve can be cooled by conduction of heat from the reed valve through the highly conductive gaskets to the intake port member below the reed valve with respect to an air intake direction and from the reed valve to the intake pipe above the reed valve with respect to the air intake direction.
Preferably, the engine is provided with an injector disposed at a position above the reed valve with respect to a flowing direction of an intake air or on a cylinder head.
Preferably, the engine is adapted to be installed on a craft for traveling on a water; and a cooling water for the water jacket is supplied from an ambient water.
According to the second aspect of the present invention, a reed valve cooling apparatus for cooling a reed valve fitted in an intake port member formed on a crankcase of an internal-combustion engine, the reed valve having a flange placed between a joining surface of the intake port member and a joining surface of an intake pipe, the reed valve cooling apparatus includes: a water jacket formed in a circumferential wall of the intake pipe; a highly heat-conductive gasket placed between the joining surface of the intake pipe and the flange of the reed valve; and a heat-insulating gasket placed between the joining surface of the intake port member and the flange of the reed valve.
The intake pipe can be effectively cooled. The reed valve can be cooled by conduction of heat from the reed valve through the highly conductive gasket to the intake pipe. Heat conduction from the intake port member to the reed valve can be effectively retarded by the heat-insulating gasket.
Preferably, the engine is provided with an injector disposed at a position above the reed valve with respect to a flowing direction of an intake air or on a cylinder head.
Preferably, the engine is adapted to be installed on a craft for traveling on a water; and a cooling water for the water jacket is supplied from an ambient water.
According to the third aspect of the present invention, an internal-combustion engine includes: a crankcase; an intake port member formed on the crankcase, the intake port member having a circumferential wall and a joining surface; an intake pipe joined to the intake port member, the intake pipe having a circumferential wall and a joining surface; a reed valve fitted in the intake port member, the reed valve having a flange placed between the joining surface of the intake port member and the joining surface of the intake pipe; and a reed valve cooling apparatus having a water jacket formed in the circumferential wall of the intake port member and a highly heat-conductive gasket placed between the joining surface of the intake port member and the flange of the reed valve.
Preferably, the reed valve cooling apparatus further includes: a water jacket formed in the circumferential wall of the intake pipe; and a highly heat-conductive gasket placed between the joining surface of the intake pipe and the flange of the reed valve.
Preferably, the internal-combustion engine further includes:
a cylinder head; and an injector disposed at a position above the reed valve with respect to a flowing direction of an intake air or on the cylinder head.
Preferably, the engine is adapted to be installed on a craft for traveling on a water; and a cooling water for the water jacket is supplied from an ambient water.
According to the fourth aspect of the present invention, an internal-combustion engine includes: a crankcase; an intake port member formed on the crankcase, the intake port member having a circumferential wall and a joining surface; an intake pipe joined to the intake port member, the intake pipe having a circumferential wall and a joining surface; a reed valve fitted in the intake port member, the reed valve having a flange placed between the joining surface of the intake port member and the joining surface of the intake pipe; and a reed valve cooling apparatus having a water jacket formed in the circumferential wall of the intake pipe; a highly heat-conductive gasket placed between th
Argenbright Tony M.
Harris Katrina B.
Kawasaki Jukogyo Kabushiki Kaisha
Oliff & Berridg,e PLC
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